mirror of https://github.com/tc39/test262.git
57 lines
1.7 KiB
JavaScript
57 lines
1.7 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-binding/ary-ptrn-elision.case
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// - src/dstr-binding/default/async-gen-func-decl-dflt.template
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/*---
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description: Elision advances iterator (async generator function declaration (default parameter))
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esid: sec-asyncgenerator-definitions-instantiatefunctionobject
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features: [generators, async-iteration]
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flags: [generated, async]
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info: |
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AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier
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( FormalParameters ) { AsyncGeneratorBody }
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[...]
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3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody,
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scope, strict).
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[...]
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13.3.3.6 Runtime Semantics: IteratorBindingInitialization
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ArrayBindingPattern : [ Elision ]
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1. Return the result of performing
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IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
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as the argument.
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12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
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Elision : ,
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1. If iteratorRecord.[[done]] is false, then
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a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
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b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
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c. ReturnIfAbrupt(next).
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d. If next is false, set iteratorRecord.[[done]] to true.
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2. Return NormalCompletion(empty).
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---*/
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var first = 0;
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var second = 0;
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function* g() {
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first += 1;
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yield;
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second += 1;
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};
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var callCount = 0;
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async function* f([,] = g()) {
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assert.sameValue(first, 1);
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assert.sameValue(second, 0);
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callCount = callCount + 1;
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};
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f().next().then(() => {
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assert.sameValue(callCount, 1, 'invoked exactly once');
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}).then($DONE, $DONE);
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